[FIX] iot: Fix support of device with protocol 0

The self don't contain 'interface_protocol'.
The 'interface_protocol' is in self.dev because we add this in 'supported' function.

closes odoo/odoo#40132

X-original-commit: 6963a016
Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>